If I were an NFL owner, GM, or coach, I'd set aside a little pot of money to try to answer some of these questions empirically. There is a lot of advantage to be gained by keeping even a few more players per season off the injured reserve list -- to say nothing of the fact that it's the right thing to do.
This prompted an interesting e-mail from Ryan Comeau:
Dynamic Athletics is a biomechanics company focused on athletes and people recovering from orthopedic injuries. Our technology has been in development for 8 years but we've only had our doors open for 7 months now. We process 3D motion-capture files in a way that deliver the full palate of kinematic & kinetic data (without force plates). This immense amount of data collected about an athlete's ability to move & how exactly they produce their movement, if managed properly, becomes a valuable time capsule for the athlete or those managing a team.